Influence of allochthonous organic matter on bacterioplankton biomass and activity in a eutrophic, sub-tropical estuary

Short-term response of phytoplankton community to over-enrichment of nutrients in a well-preserved sub-tropical estuary

“…The phytoplankton response to this nutrient enrichment results in Chlorophyll a concentrations of 15.5 mgL -1 , abundances of 3 x10 7 cells L -1 and primary production rates of 15.85 mg C L -1 h -1 (BARRERA-ALBA et al, 2009). Also detected in this region was the presence of high densities of opportunistic species of microalgae such as Skeletonema cf.…”

Hydrology and Biota Interactions as Driving Forces for Ecosystem Functioning

“…Episodic meteorological events (e.g., wind storms and high rainflow episodes), for example, stimulate heterotrophic bacterioplankton due to increased availability of organic matter and/or inorganic nutrients associated to increased con tinental runoff or benthic resuspension (Cotner et al, 2000;Grémare et al, 2003;Alonso-Saéz et al, 2008;Solic et al, 2009). Variability in river discharge rates, usually considered a proxy for organic carbon flux into estuarine systems (Jassby et al, 1993), is also positively related to bacterial production and growth over seasonal (Murrell et al, 1999;Schultz et al, 2003) and interannual time scales (Murrell, 2003;Shiah et al, 2006;Barrera-Alba et al, 2009). In some estuaries, a shift in ecosystem metabolism toward heterotrophic dominance is observed under increased freshwater discharge rates (see Hitchock et al, 2010).…”

“…Bacterial isotopic signatures as well as bacterial annual dynamics suggest that microphytobenthos and macrophytes (e.g., seagrasses, saltmarshes, mangroves, and macroalgae), hydrologically sensitive groups, are relevant nonphytoplanktonic autochtho nous sources of both DOM and particulate organic substrates for heterotrophic bacteria (Chin-Leo and Benner, 1991;Jassby et al, 1993;Bano et al, 1997;Alongi, 1998;Hopkinson et al, 1998;Ziegler and Benner, 1999;Mann, 2000;Barbosa, 2006;Grami et al, 2008;Barrera-Alba et al, 2009;Barbosa, 2010). Heterotrophic bacterioplankton and their predators possibly play a pivotal role in channeling primary production of macrophytes to metazoans (Ziegler and Benner, 1999;Grami et al, 2008;Barbosa, in press).…”

“…The assimilation of allochthonous (riverine) or resus pended organic matter by heterotrophic bacterioplankton is fundamental for estuarine food-web dynamics and biogeochemical cycling within periods (e.g., winter), ecosys tems (e.g., turbid and heterotrophic systems) or locations (e.g., estuarine maximum turbidity zones) of reduced primary production (Cotner et al, 2000;David et al, 2006;Barrera-Alba et al, 2009). The establishment and evaluation of flood-management practices should take into account that river-flow patterns affect not only phytoplankton (primary producers) but also heterotrophic bacteria (consumers).…”

Estudo da abundância, proveniência e padrões de distribuição elementar em sedimentos de superfície e perfis sedimentares no Complexo Estuarino-Lagunar de Cananéia-Iguape, São Paulo - Brasil, com ênfase aos elementos terras raras e seu significado ambiental

“…A região está assentada sobre uma planície costeira arenosa (ALMEIDA, 1964; (KUTNER, 1962;TESSLER, 1982;FURTADO, 1983;MAHIQUES, 1993;BONETTI-FILHO;CONTI;FURTADO, 1996; BERBEL, 2008;BARRERA-ALBA et al, 2009;MAHIQUES et al, 2009;PISETTA, 2010;COELHO, 2011;ESCHRIQUE, 2011;BASTOS, 2014;AGOSTINHO, 2015;TRAMONTE et al, 2016;SCIGLIANO, 2016 …”